The BTK is a Medium Tackle lure with 10" sized skirt saddles. The head shape has evenly distributed front and rear taper with a cupped/inverted nose.
BOM Skirt Size 502.
From "Bonze" Fleet on the BTK:
"This cup face pusher is without doubt one of the most consistant lures in generally unfavourable conditions. Its long smoke trails raises fish and provokes the hardest calculated hits. Beat, Torture and Kill suits this lure well, just watch all this unfold right in front of your eyes. Easy to run, this lure will tolerate the worst conditions you can throw at it. Skirted Length: 330mm / 13” Hook Size: 9/0 – 10/0 Leader Size: 300lb – 400lb."
This particular head is from their Custom lineup with purple Mother of Pearl with blue glitter covering the insert inside a purple resin pour. Skirted in blue/gold with black bars over silver/gold/black.